Social media companies are fighting an expensive and increasingly complex battle against Russian trolls who are using catchy memes, bots and fake accounts to influence elections and sow discord in the U.S

Nathan and Ellen Rigney were asleep just before midnight Monday when the baby monitor next to their bed started making a beeping noise. Next, the Texas couple started hearing "sexual expletives," which they assumed were coming from inside their 4-month-old son's room. "Then [he] said 'I’m going to kidnap your...

Social media companies are fighting an expensive and increasingly complex battle against Russian trolls who are using catchy memes, bots and fake accounts to influence elections and sow discord in the U.S